(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.  

What the kinetic energy of the ball just before it hits the ground ?

A cell of e.m.f. 2 V and internal resistance 1.2 Ω is connected to an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in following figure.

Find:

1. The reading of the ammeter,
2. The potential difference across the terminals of the cells, and
3. The potential difference across the 4.5 Ω resistor.

A certain radioactive nucleus emits a particle that leaves its mass unchanged, but increased its atomic number by one. Identify the particle and write its symbol.

What changes occurs in the nucleus of radioactive elements when it emits (a) an alpha particle (b) beta particle and (c) gamma radiations? Give one example in each case in support of your answer.

A nucleus is \[\ce {^24_11 Na}\] is β-radioactive.

What are the numbers 24 and 11 called? 

A nucleus of stable phosphorus has 15 protons and 16 neutrons.

1. What is its atomic number and mass number?
2. The nucleus of radio phosphorous has one neutron more than the stable nucleus. What will be its atomic number and mass number?
3. What will be the atomic number and mass number of new nucleus formed by decay of a β-particle by the radio phosphorus in part (b)?

A nucleus \[\ce {^A_Z X}\] emits 2 α particles and 1 β particles to form a nucleus \[\ce {^222_85 R}\]. Find the atomic nucleus and mass number of X.

Complete the following nuclear change:

\[\ce {^a_x P -> Q +  ^0_-1β}\]

Complete the following nuclear change:

\[\ce{^238_92U -> ^234_90Th}\] + ______ + energy

Complete the following nuclear change:

\[\ce {^238_92 P  \text ->[α] Q \text ->[β] R \text ->[β] S}\]

Complete the following nuclear change:

\[\ce {^A_Z X \text ->[α] X_1 \text ->[γ] X_2 \text ->[2β] X_3}\]

Complete the following nuclear changes:

\[\ce {X \text ->[β] X_1 \text ->[α] X_2 \text ->[α] ^172_69 X_3}\]

A coil has a self-inductance of 0·05 Henry. Find the magnitude of the emf induced in it when the current flowing through it is changing at the rate of 100 As^-1.

What is an electromagnet?

Write five forms of energy.

What do you understand by mechanical energy?

What do you understand by the potential energy of the body?

What do you understand by the kinetic energy of the body?

Give three examples of bodies possessing kinetic energy.

How is kinetic energy possessed by a moving body measured?